Write the roster form for the given set:
“Set of all months in a year having at least $30$ days.”

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Solution

In a year if we consider all the months, apart from February that has $28$ days (or $29$ days in a leap year), have at least $30$ days. Thus February will not be considered in this set.
Hence roster form will be represented as $\{J a n u a r y, M a r c h, A p r i l, M a y, J u n e, J u l y, A u g u s t, S e p t e m b e r, O c t o b e r, N o v e m b e r, D e c e m b e r\}$

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